div, form{
    align-content: center;
    text-align: center;
}

form td, th {
    text-align: center;
    align-content: center;
}

a {
    text-decoration-line: none;
}

table {
    /*border="1" cellspacing="0" cellpadding="5" style="margin: 0 auto"*/
    /*border: 1px solid black;*/
    margin: 0 auto;
    border-collapse: collapse;
}
table tr, td, th {
    border: 1px solid black;
}


.text-center {
    text-align: center;
    align-content: center;
}

select {
    width: 150px
}

html{
    height: 100%;
}

body {
    height: 100%;
}

/* 弹窗 (background) */
.modal {
    display: none; /* 默认隐藏 */
    position: fixed; /* 固定定位 */
    z-index: 1; /* 设置在顶层 */
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.4);
}

/* 弹窗内容 */
.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 2px solid #888;
    width: 50%;
    height: 40%;
    /*overflow: hidden;*/
}

/*弹窗标题*/
.modal-content h4 {
    /*position: relative;*/
    text-align: left;
    width: 100%;
}

.modal-content div {
    position: relative;
    margin: 0;
    text-align: left;
    width: 100%;
    overflow: auto;
    height: 70%;
}

/* 关闭按钮 */
.close {
    position: relative;
    bottom: 0;
    float: bottom;
    font-size: 24px;
    font-weight: bold;
}





